22101220 has 12 divisors (see below), whose sum is σ = 46412604. Its totient is φ = 8840480.

The previous prime is 22101193. The next prime is 22101239. The reversal of 22101220 is 2210122.

It can be written as a sum of positive squares in 2 ways, for example, as 11655396 + 10445824 = 3414^2 + 3232^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 22101197 and 22101206.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 552511 + ... + 552550.

It is an arithmetic number, because the mean of its divisors is an integer number (3867717).

Almost surely, 2^22101220 is an apocalyptic number.

22101220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22101220 is an abundant number, since it is smaller than the sum of its proper divisors (24311384).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

22101220 is a wasteful number, since it uses less digits than its factorization.

22101220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1105070 (or 1105068 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 22101220 is about 4701.1934654936. The cubic root of 22101220 is about 280.6330066349.

22101220 divided by its sum of digits (10) gives a palindrome (2210122).

Adding to 22101220 its reverse (2210122), we get a palindrome (24311342).

The spelling of 22101220 in words is "twenty-two million, one hundred one thousand, two hundred twenty".